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Re: [Discuss-gnuradio] power amplifiers on TX


From: Ron Economos
Subject: Re: [Discuss-gnuradio] power amplifiers on TX
Date: Wed, 30 Dec 2015 16:53:04 -0800
User-agent: Mozilla/5.0 (X11; Linux i686; rv:24.0) Gecko/20100101 Thunderbird/24.6.0

In Canada, you can use up to 2250 watts PEP output on SSB.

http://www.ic.gc.ca/eic/site/smt-gst.nsf/eng/sf01226.html#p10.2

In the US, it's 1500 watts PEP output in any mode.

The Kuhne Electronic equipment is excellent stuff. It's essentially commercial equipment that's been re-purposed for the ham bands. In fact, as a licensed operator, you can purchase their industrial products. For example, I'm using this amplifier for 70cm digital television.

http://shop.kuhne-electronic.de/kuhne/en/shop/industrial/prof-power-amplifier/KU+PA+04105025+A++UHF+MOSFETPower+Amplifier/?card=413

However, due to the high PAPR of digital waveforms, it only delivers a few watts of average linear power.

Ron

On 12/30/2015 04:26 PM, Kevin McQuiggin wrote:
The amateur limit is 1000 Watts.  Personally I ran 800+ Watts on the 2
metre band in the late 1980s for my EME (moonbounce) station.  All
analog, single long-boom Yagi.  I used a 2M downconverter and listened
on my 10M receiver as it was way more sensitive than my 2M rig.

Over about a year's operation I heard about 10 stations via EME and
worked only 2.  Still, that was a very good operational record for a
single Yagi station of the era.

Possibly relevant to Marcus' and others' warnings, my power amplifier
did EXPLODE on one occasion due to dried-out filter capacitors.  Big
fireball, and little bits of paper blown right through the amplifier
case and all over the room.  It was spectacular :=/

My wife tells the story very well: she was in the kitchen and heard this
big "BOOM".  She called upstairs "Is everything alright?" and I calmly
replied "No problem.  Could you bring the fire extinguisher up here please?"

Fortunately no fire, and I replaced the filter capacitors.  The
amplifier was fine - a good bonus, as I had borrowed it from a research
lab at a local university for a couple of weeks.

With the new weak signal DSP techniques, I hear that 100 Watts and a
single Yagi will get you many contacts, although the data rate will be
very low.  Still, it works and that is amazing!

I think Daniel was just asking if these German amplifiers are good
quality.  I hear that they are, and that they work very well, although I
have never used or seen one in person.  I hear they stand behind their
gear, and will also do custom designs.

Kevin (VE7ZD)


On 15-12-30 04:03 PM, Johnathan Corgan wrote:
On Wed, Dec 30, 2015 at 3:14 PM, James Humphries
<address@hidden <mailto:address@hidden>> wrote:
     I'm on Marcus' side with that output power, that's a scary high
     output. I start to sweat at 10W... :)


​Heh, I connected a USRP to a 20KW PA once.  Sweating was only one of
several things done in anticipation :)​
--
Johnathan Corgan
Corgan Labs - SDR Training and Development Services
http://corganlabs.com


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